US4193565A - Seatbelt retractor - Google Patents

Seatbelt retractor Download PDF

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Publication number
US4193565A
US4193565A US05/960,596 US96059678A US4193565A US 4193565 A US4193565 A US 4193565A US 96059678 A US96059678 A US 96059678A US 4193565 A US4193565 A US 4193565A
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US
United States
Prior art keywords
webbing
clutch
vibration sensor
wind
seatbelt retractor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/960,596
Other languages
English (en)
Inventor
Keiichi Tamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokai Rika Co Ltd
Original Assignee
Tokai Rika Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tokai Rika Co Ltd filed Critical Tokai Rika Co Ltd
Application granted granted Critical
Publication of US4193565A publication Critical patent/US4193565A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
    • B60R22/40—Belt retractors, e.g. reels self-locking in an emergency responsive only to vehicle movement

Definitions

  • the present invention relates to a seatbelt retractor of a vehicle, and particularly, to a seatbelt retractor capable of safely and reliably operating during running on the bad road and the like causing vibrations to the vehicle.
  • the conventional seatbelt retractors have been constructed such that an acceleration sensor senses an acceleration suddenly caused to the vehicle so as to lock the wound-out operation of the webbing restraining and protecting an occupant of the vehicle.
  • an acceleration sensor senses an acceleration suddenly caused to the vehicle so as to lock the wound-out operation of the webbing restraining and protecting an occupant of the vehicle.
  • a vibration sensor is provided in addition to the acceleration sensor, and the wound-up operation of the webbing is locked when the vibrations are caused to the vehicle.
  • a webbing 1 is wound up by a take-up shaft 2, and a first ratchet gear wheel 3 is coaxially fixed in the take-up shaft 2.
  • a first pawl 4 is rotatably supported by a frame at a position adjacent to the ratchet gears of the first ratchet gear wheel 3, and the first pawl 4 is engaged with the first ratchet gear wheel 3 by the operation of an acceleration sensor 5, to thereby lock the wind-out operation of the webbing 1 in an emergency of the vehicle.
  • coaxially fixed on the take-up shaft 2 is a second ratchet gear wheel 6, and a second pawl 7 engageable with the ratchet gears of the second ratchet gear wheel 6 is rotatably supported by the frame.
  • the second pawl 7 engages the second ratchet gear wheel 6 by the operation of the vibration sensor 8 to lock the wind-up operation of the webbing 1 in the case of unusual vibrations caused to the vehicle.
  • a unique seatbelt retractor including a vibration sensor for sensing the vibrations caused to the vehicle; and a frictional clutch mechanism operated by said vibration sensor to brake the wind-up operation of a webbing.
  • FIG. 1 is a side view showing one embodiment of the conventional seatbelt retractor
  • FIG. 2 is a side view showing a first embodiment of the seatbelt retractor according to the present invention.
  • FIG. 3 is a side view showing a second embodiment of the present invention.
  • FIG. 2 shown in FIG. 2 is an explanatory view showing a first embodiment of the seatbelt retractor according to the present invention, in which a webbing 11 is installed on a take-up shaft 12.
  • a ratchet gear wheel 13 Solidly secured to the take-up shaft 12 is a ratchet gear wheel 13 provided at the outer periphery thereof with ratchet teeth 13A.
  • a pawl 14 is rotatably supported by a frame outwardly of the ratchet gear wheel 13. The pawl 14 is rotated by an acceleration sensor 15 in the counterclockwise direction about a fulcrum, engages the ratchet teeth 13A of the ratchet gear wheel 13, and stops the rotation of the webbing 11 of the take-up shaft 12 from being rotated in the wind-out direction.
  • a clutch disk 16 is coaxially fixed on the take-up shaft 12.
  • a clutch lever 17 is rotatably supported by the frame outwardly of the clutch disk 16, and a working surface 17A of said clutch lever 17 is relatively confronted by a clutch surface 16A formed by the outer peripheral surface of the clutch disk 16.
  • the clutch lever 17 is rotated by the operation of a vibration sensor 18 in the clockwise direction, engages the working surface 17A thereof with the clutch surface 16A when the vibrations are caused to the vehicle, to thereby brake the rotation of the webbing 11 of the take-up shaft 12 in the wind-up direction.
  • the clutch lever 17 is rotated in the clockwise direction, engages the clutch 16, brakes the rotation of the take-up shaft 12 in the counterclockwise direction to lock the wind-up condition of the webbing 11.
  • the wind-up operation of the webbing 11 is stopped and the slack of the webbing 11 for the occupant becomes large, if a wind-out force is applied to the webbing 11 so as to make the contact pressure force between the clutch lever 17 and the clutch disk 16 to be zero (0) in said seatbelt retractor, then the clutch lever 17 is disengaged from the clutch disk 16 so that excessive slack will not be applied to the webbing 11.
  • the clutch lever 17 is disengaged from the clutch disk 16 under a wind-up load condition lower than a certain extent, and consequently, the webbing 11 will not be left in a condition where both the wind-out and wind-up operations are prevented.
  • FIG. 3 is an explanatory view showing a second embodiment of the seatbelt retractor according to the present invention, in which a webbing 21 is installed on a take-up shaft 22.
  • Solidly secured to the take-up shaft 22 is a ratchet gear wheel 23 which is provided at the outer periphery thereof with ratchet teeth 23A.
  • a pawl 24 is provided outwardly of the ratchet gear wheel 23, the pawl 24 is rotated by an acceleration sensor 25 in the counterclockwise direction, engages the ratchet teeth 23A of the ratchet gear wheel 23 to stop the rotation of the take-up shaft 22 in the clockwise direction, locking the wind-out operation of the webbing 21.
  • a clutch disk 26 is in frictional contact with and coaxially supported by the take-up shaft 22, and the clutch disk 26 is provided at the outer periphery thereof with ratchet teeth 26A.
  • a pawl 27 is provided outwardly of the clutch disk 26, the pawl 27 is rotated by the operation of a vibration sensor 28 in the clockwise direction to engage the ratchet teeth 26A, stopping the rotation of the clutch disk 26 in the counterclockwise direction. Due to the stopping of the clutch disk 26, the take-up shaft 22 being in frictional contact with said clutch disk 26 is braked in its rotation in the counterclockwise direction, locking the wind-up condition of the webbing 21.
  • the wind-out operation of the webbing 21 is locked by the operation of the acceleration sensor 25, and, at the time of the operation of the vibration sensor 28, the wind-up operation of the webbing 21 is braked by the frictional contact between the clutch disk 26 and the take-up shaft 22, and the slack occurred in the webbing 21 is automatically and slowly wound up. Additionally, at the time when both the acceleration sensor 25 and the vibration sensor 28 operate simultaneously, the webbing 21 does not fall in a condition where both the wind-out and wind-up operations are prevented because the clutch disk 26 and the take-up shaft 22 are in frictional contact with each other.
  • acceleration sensors for sensing the acceleration of the vehicle may be utilized as the vibration sensors 18 and 28 used in the above embodiments.
  • the seatbelt retractor according to the present invention includes the vibration sensor for sensing the vibrations of the vehicle and the frictional clutch mechanism to be operated by the vibration sensor for braking the wind-up operation of the webbing, and hence, there is presented such an advantage that, even in the vibrating condition of the vehicle, the webbing does not fall into a condition where both the wind-out and wind-up operations are prevented, so that the occupant can be restrained safely and reliably.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)
US05/960,596 1977-11-16 1978-11-14 Seatbelt retractor Expired - Lifetime US4193565A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP52-154748[U] 1977-11-16
JP1977154748U JPS5479624U (enrdf_load_stackoverflow) 1977-11-16 1977-11-16

Publications (1)

Publication Number Publication Date
US4193565A true US4193565A (en) 1980-03-18

Family

ID=15591040

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/960,596 Expired - Lifetime US4193565A (en) 1977-11-16 1978-11-14 Seatbelt retractor

Country Status (2)

Country Link
US (1) US4193565A (enrdf_load_stackoverflow)
JP (1) JPS5479624U (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310175A (en) * 1980-02-19 1982-01-12 Allied Corporation Belt clamping apparatus with self-aligning feature
US4943010A (en) * 1987-09-24 1990-07-24 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusko Acceleration sensor
US5829100A (en) * 1996-03-25 1998-11-03 Rosink Gmbh & Co. Kg Sliver can spring plate retaining device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897913A (en) * 1974-05-28 1975-08-05 Gen Motors Corp Locking mechanism for a vehicle restraint belt retractor
US3908928A (en) * 1972-05-15 1975-09-30 Honda Motor Co Ltd Seat belt devices for automobiles and the like
US3957223A (en) * 1975-05-12 1976-05-18 Allied Chemical Corporation Limiter for vehicle safety belt tension-relieving apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908928A (en) * 1972-05-15 1975-09-30 Honda Motor Co Ltd Seat belt devices for automobiles and the like
US3897913A (en) * 1974-05-28 1975-08-05 Gen Motors Corp Locking mechanism for a vehicle restraint belt retractor
US3957223A (en) * 1975-05-12 1976-05-18 Allied Chemical Corporation Limiter for vehicle safety belt tension-relieving apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310175A (en) * 1980-02-19 1982-01-12 Allied Corporation Belt clamping apparatus with self-aligning feature
US4943010A (en) * 1987-09-24 1990-07-24 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusko Acceleration sensor
US5829100A (en) * 1996-03-25 1998-11-03 Rosink Gmbh & Co. Kg Sliver can spring plate retaining device

Also Published As

Publication number Publication date
JPS5479624U (enrdf_load_stackoverflow) 1979-06-06

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